Interpolating – Performance Charts and Temperature at Altitude
Asked by: JunJug 21576 views Flight Instructor, Private Pilot, Student Pilot
Hi AskACFI!
I'm struggling with interpolating between figures on the Cessna 172N performance charts. Adding two numbers and dividing by two works fine and dandy when the figure you are interpolating for falls exactly bang on between the two.
Regarding FD's, the reports only provide temperatures for 6000' and onwards.
For cruising altitudes at say, 4500', how do you interpolate to find a temperature at that altitude? I've been looking at nearest weather station enroute (halfway) for temperature as outlined in the Flight Training Manual. Can someone be kind enough to tell me exactly how to accurately interpolate?
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